JP3281865B2 - Lead plate pressing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved technique of a lead plate pressing method for pressing a lead plate from a hoop lead plate material.

[0002]

2. Description of the Related Art In recent years, various electronic devices have been reduced in size and weight, and a large number of devices that are light and easy to carry even when they are carried have been commercialized. For a portable device such as a mobile phone, a battery is used because a commercial AC cannot be used as a driving power source. As the battery to be used, a battery having a high energy density that can withstand continuous use for a long time and discharge by a large current is desired.

[0003] Therefore, a pack battery in which a plurality of secondary batteries such as a nickel-cadmium battery and a nickel-hydrogen battery are combined has been widely used. The secondary battery can be repeatedly used by charging and discharging, and a high-voltage or high-capacity power supply can be easily obtained by combining a plurality of the secondary batteries. Further, when the battery packs are combined, the shape is matched to the shape of the battery mounting portion of the electric device, whereby a battery pack suitable for the device can be formed.

[0004] Recently, lithium ion batteries having higher energy density than nickel-cadmium batteries have been developed. However, since a lithium ion battery is liable to be deteriorated when overcharged or overdischarged, a protection circuit for preventing overcharge or overdischarge is required.

[0005] Therefore, in a battery pack containing a lithium ion battery, a printed circuit board or the like constituting a protection circuit is housed together with the battery.

[0006] Japanese Patent Application Laid-Open No. 08-329913 describes the above matters in detail.
This will be described with reference to FIGS. 10 is a box-shaped main body case, and 11 is a lid. The body case 10 and the lid 11 constitute the outer shape of the battery pack. Body case 10
Has a step portion 12 formed in a portion to which the lid 11 is attached, and by attaching the lid 11 thereto, the end face of the main body case 10 and the lid 11 become flat to complete a clean rectangular parallelepiped outer shape. .

A pair of terminal windows 13 are opened in the lateral side plate of the main body case 10, and a rib 1 is formed in the longitudinal side plate.
4 are provided. Of the four corners of the body case 10, two corners on the side of the side plate where the ribs 14 are provided are provided with reverse storage preventing portions 15. The remaining two corners are almost right-angled corners. Reference numeral 20 denotes a prismatic lithium ion battery. The battery 20 has an outer shape in which an electrode portion 22 protrudes from a rectangular outer can 21. The electrode portion 22 is a negative electrode (or a positive electrode), and the outer casing 21 is all a positive electrode (or a negative electrode). Reference numeral 23 denotes insulating paper, which has a hole so that the electrode portion 22 is exposed. The insulating paper 23 is fixed to the battery 20 with a double-sided tape or the like. This insulating paper 23 is used to connect a lead plate 42, which will be described
2 prevents the short circuit due to the contact between the lead plate 42 and the outer can 21 when welding is performed.

Reference numeral 30 denotes a first printed board, and 31 denotes a second printed board. Each of the two printed boards 30 and 31 has an elongated plate shape, and a circuit element 33 is mounted on a central portion of the first printed board 30 excluding an end region 32. As for the circuit element 33, a tall element and a short element are mixed, and there is a slight space between each element.
The circuit element 33 is connected to the lithium-ion battery 20 to form a protection circuit for protecting the battery from overcharging and overdischarging.

Reference numeral 35 denotes a thermistor whose resistance value changes in accordance with a change in temperature. The thermistor 35 is connected in series with the battery 20 to prevent an excessive current from flowing through the battery 20. The thermistor 35 is insulated from the battery outer can 21 by insulating paper 36. The insulating paper 36 is fixed to the thermistor 35 with a double-sided tape.

The two substrates 30, 31 and the thermistor 3
5 and the width of the insulating paper 36 are the same as the thickness of the battery 20, and the substrates 30, 31 and the thermistor 35 are
Is not viewed from the thickness of the battery 20. Therefore, the inner dimension of the thickness of the main body case 10 is substantially the same as the thickness of the battery 20, and it is not necessary to further increase the thickness.

Reference numeral 40 is a lead plate made of a first Ni plate, and 41 is a lead plate made of a second Ni plate. 42 is the electrode section 2
2 is a lead plate made of a Ni plate for connecting the thermistor 2 to the thermistor 35. The first lead board 40 connects the first printed board 30 and the second printed board 31. Second
Lead plate 41 connects the second printed circuit board 31 and the outer can 21 of the battery. With these lead plates, the thermistor 35 and the first printed circuit board 30 are arranged along the longitudinal side surface of the battery 20,
The printed circuit board 31 is arranged along the lateral side in the lateral direction. Then, the second lead plate 41 is further bent and connected to the outer can 21 on the side facing the first printed circuit board 30.

The lead plate 41 includes a thermistor 35,
It is electrically connected to the battery outer can 21 via the first printed board 30 and the second printed board 31. On the other hand, the lead plate 42 is electrically connected to the electrode portion 22 different from the outer can.

Hereinafter, a method of pressing the lead plates 40, 41 and 42 will be described with reference to the drawings.

6 and 7, reference numeral 50 denotes a lead plate 4.
Reference numerals 0, 41 and 42 denote a plurality of stamped hoop lead plate materials. The hoop lead plate material 50 fed by a conveying means (not shown) includes a pair of press dies, a male mold 51 and a female mold 52. Pressed at each lead plate 40,
41 and 42 are punched. 53 is a stripper for holding the frame of the hoop lead plate material 50, and 54 is a spring.

In the following, the lead plates 40, 41, 4 are successively formed from the hoop lead plate material 50 fed in a predetermined amount in the same manner.
2 is pressed.

FIG. 8 shows the lead plates 40, 41,
FIG. 8 shows various shapes of the lead plates 40, 41, and 42 used in the lithium ion battery of the present embodiment.
A), three types of lead plates 41 (FIG. 8B) having rounded ends at both ends and a lead plate 42 (FIG. 8C) having a rounded end and a slit at the center at the other end are used. I have.

[0017]

In the conventional pressing method, as shown in FIG. 7, a lead plate shape is removed from a wide hoop lead plate material. Was discarded, and the hoop lead board material waste was wasted.

In a portable device such as a mobile phone, the size of the lead plates 40, 41, and 42 is reduced in accordance with the size and shape of the battery of the other party because the size of the lead plates 40, 41, and 42 is reduced. Since the board size and shape are determined, the length is often different for each model.

Then, such lead plates 40, 41,
At present, press dies are manufactured every time there is a change in the length size or shape of 42. In addition to the initial cost of the press dies, it takes 3 to 4 weeks for product delivery. A considerable amount of adjustment is required, and it is impossible to simultaneously start many types of dies corresponding to various lead plates due to the processing capability of the dies. In particular, since the life time of such a portable device is as short as 3 to 6 months, it was necessary to take early production measures. Further, since the sample trial production needs to be performed in about one week, it is necessary to perform the processing by etching or laser processing, and the cost of the trial production is increased.

Accordingly, an object of the present invention is to provide a lead plate pressing method and a press die that can quickly respond to a change in the type of lead plate.

[0021]

Accordingly, the present invention provides a lead plate 40, 41, 4 which is soldered from a hoop lead plate material 60 to a pad electrode on a mounting substrate on which circuit elements are mounted.
In the lead plate pressing method of pressing the lead 2, the hoop lead plate material 60 corresponding to the width of the lead plates 40, 41, 42 is pressed by a feed amount corresponding to the length of the lead plates 40, 41, 42. The hoop lead plate material 60 is sent out to the mold position, and from the hoop lead plate material 60 via a pair of male molds 61 and female molds 62 corresponding to the end shapes of the lead plates 40, 41, 42, respectively. 42 are pressed.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the lead plate pressing method of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 60 denotes a hoop lead plate material which has been cut in advance to a desired lead plate width (W: 3 mm or 4 mm in the present embodiment).
The lead plates 40, 41 and 42 are pressed by the pair of press dies from the hoop lead plate material 60 fed by a predetermined amount by the conveying means 65. Reference numeral 61 denotes a male die of the press die, and reference numeral 62 denotes a female die that fits along the outer shape of the male die 61 with a predetermined clearance. 63 is a stripper for holding the hoop lead plate material 60, and 64 is a spring.

FIG. 2 shows various punch cross-sectional shapes of the male mold 61. The male mold 61A shown in FIG. 2A is used for the lead plate 40 having both straight ends shown in FIG. The male mold 61B shown in FIG. 2B is for the lead plate 41 having rounded ends at the both ends shown in FIG. 8B, and the male mold 61C shown in FIG.
Is rounded and the other end is for a lead plate 42 with a slit in the center. For example, when a lead plate having a slit at the center of both ends is pressed, a male mold 61D shown in FIG. 2D may be used.

In the present embodiment, the length of the various lead plates 40, 41, and 42 is adjusted by adjusting the feed amount by the transfer means 65 as described above.
For example, as shown in FIG.
Are fed until the end of the lead plate reaches the stopper 66, and press working is performed there. By adjusting the distance between the stopper 66 and the press die, the various lead plates 40, 4 are formed.
You may make it correspond to the length size of 1,42,
Further, the feed amount may be adjusted using a sensor or the like.

In the following, desired lead plates 40 and 4 are successively formed from the hoop lead plate material 60 fed in a predetermined amount in the same manner.
1, 42 are pressed.

As described above, in the present invention, the hoop lead plate material 6 corresponding to the width of the lead plates 40, 41, 42 is used.
0 is fed to a pair of press die positions at a feed amount corresponding to the length of the lead plates 40, 41, 42, and there is a male die corresponding to the end shape of the lead plates 40, 41, 42. By performing press working using 61A, 61B, 61C (and a female mold), the press mold portion becomes a waste material 60.
A (see FIG. 1) can be dealt with, so that the waste of the punching allowance, which is the conventional waste of hoop lead plate material, can be greatly reduced and it is economical.

At present, the widths of the lead plates 40, 41 and 42 are mainly 3 mm and 4 mm, and therefore, only press dies corresponding to 3 mm and 4 mm are prepared. (Note that, for the lead plate in which both ends are straight as shown in FIG. 2A, it is possible to use both the 3 mm width and the 4 mm width.) L) Since it is possible to quickly respond to the change, it is not necessary to manufacture a mold for each length, so that the initial cost of the mold can be greatly reduced.

[0029]

According to the present invention, press dies corresponding to the end portions of various lead plates are prepared, and the hoop lead plate material is fed to the die position by a transport means at a feed amount corresponding to the lead plate length. Therefore, by pressing, the waste of hoop lead plate material waste as in the past can be greatly reduced, and furthermore, it is possible to quickly respond to the change of the lead plate model, and the mold required for each size is required. Initial costs can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a lead plate pressing method of the present invention.

FIG. 2 is a plan view showing a punch cross-sectional shape of various press dies of the present invention.

FIG. 3 is a top view showing the lead plate pressing method of the present invention.

FIG. 4 is an assembly view of a battery using the lead plate of the present invention.

FIG. 5 is a diagram when a battery is mounted on a main body case.

FIG. 6 is a view showing a conventional lead plate pressing method.

FIG. 7 is a plan view showing a conventional hoop lead plate material.

FIG. 8 is a plan view showing a lead plate shape.

[Explanation of symbols]

 40, 41, 42: Lead plate 60: Hoop lead plate material 61: Male mold 61A: Male mold 61B: Male mold 61C: Male mold 61D: Male mold 62: Female mold

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01L 23/50 B21D 28/00 B21D 43/02

Claims (1)

(57) [Claims] A lead plate pressing method for pressing a lead plate connected via solder to a solder-fixable pad electrode provided on the surface of a mounting substrate (or the back surface of a mounting substrate) on which a circuit element is mounted. In a state in which a lead plate material corresponding to the width dimension of the lead plate has been fed to a press position by a feed amount corresponding to the length dimension of the lead plate, the end shape of the lead plate and the next lead
The lead through a press die corresponding to the end shape of the plate
A lead plate pressing method, wherein an end of an adjacent lead plate is pressed from a plate material .